/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineNotificationTransportManager.h
Receive a message from a specific transport, convert to notification, and pass on for delivery
bool ReceiveTransportMessage ( [FNotificationTransportId](API\Plugins\OnlineSubsystem\FNotificationTransportId) TransportType, const [IOnlineNotificationTransportMessage](API\Plugins\OnlineSubsystem\Interfaces\IOnlineNotificationTransportMess-) & TransportMessage )